Unity3D实现鼠标对物体进行移动,旋转,缩放（类似于编辑模式）

位移：

 ///

    /// 位移拖拽接口
    ///

    public class PosDragAxis : IDragAxis
    {
        Vector3 pos;
        public void DragAxis(GameObject go, Axis a, Vector3 mousePos, Vector3 GOScPos,
            Vector3 offset)
        {
            //获取鼠标的世界坐标
             pos = Camera.main.ScreenToWorldPoint(new Vector3(Input.mousePosition.x,
                Input.mousePosition.y, GOScPos.z))+offset ;
            if (a == Axis.X)
            {
                //只变换x
                go.transform.position= new Vector3(pos.x, go.transform.position.y, go.transform.position.z);
            }
            else if(a == Axis.Y)
            {
                //只变换y
                go.transform.position = new Vector3(go.transform.position.x, pos.y, go.transform.position.z);
            }
                else
            {
                //只变换z
                go.transform.position = new Vector3(go.transform.position.x, go.transform.position.y, pos.z);
            }
          
        }
    }

//旋转

 ///

    /// 位移拖拽接口
    ///

    public class RotateDragAxis : IDragAxis
    {

         //旋转速度
        public float speed = .5f;
        //旋转的角度
        float ang;
        //旋转的上一个向量
        public Vector3 lastVector;
        //旋转的现在向量
        private Vector3 newPos;
        //摄像机到物体的向量和物体自身的方向的角度
        private float an;
        //设置旋转初始向量
        public void SetLastPos(Vector3 pos)
        {
            lastVector = pos;
        }

        public void DragAxis(GameObject go, Axis a, Vector3 mousePos, Vector3 GOScPos,
            Vector3 offset)
        {
           
            // var local=  go.transform.InverseTransformPoint(pos);
            var newVector = Input.mousePosition - GOScPos;

            //叉乘获取角度正负
            Vector3 cross= Vector3.Cross(lastVector, newVector);
            float ang = Vector3.Angle(lastVector, newVector);
            ang = cross.z > 0 ? -ang : ang;

            if (a == Axis.X)
            {
                //获取摄像机到物体的向量和物体自身的方向的角度
                 an = Vector3.Angle(go.transform.position - Camera.main.transform.position, go.transform.right);
                //根据角度判断旋转角度的正负
                if (an < 90f || an > 270f) ang = -ang;
               
                go.transform.Rotate(Vector3.right, ang * speed, Space.Self);
            }
            else if (a == Axis.Y)
            {
                 an = Vector3.Angle(go.transform.position-Camera.main.transform.position, go.transform.up);

                if (an < 90f || an > 270f) ang = -ang;
             
                go.transform.Rotate(Vector3.up, ang * speed, Space.Self);
            }
            else
            {
                 an = Vector3.Angle(go.transform.position - Camera.main.transform.position, go.transform.forward);

                if (an < 90f || an > 270f) ang = -ang;
           
                go.transform.Rotate(Vector3.forward, ang * speed, Space.Self);
            }
            //必要一步，过渡
            lastVector = newVector;
        }
    }

//缩放

///

    /// 缩放拖拽接口
    ///

    public class ScaleDragAxis : IDragAxis
    {
        //增量
        float delet;

        //上一级位置 自身坐标
        public Vector3 lastPos;

        //鼠标相对聚焦物体的坐标
        Vector3 pos;

        //设置初始位置
        public void SetLastPos(Vector3 pos)
        {
            lastPos = pos;
        }

        public void DragAxis(GameObject go, Axis a, Vector3 mousePos, Vector3 GOScPos,
            Vector3 offset)
        {
            //获取鼠标相对聚焦物体的坐标
            pos = go.transform.InverseTransformDirection( Camera.main.ScreenToWorldPoint(new Vector3(Input.mousePosition.x,
                Input.mousePosition.y, GOScPos.z)) + offset);

            if (a == Axis.X)
            {
                //获得x轴的增量
                delet = pos.x - lastPos.x;

                //赋值
                go.transform.localScale = new Vector3(go.transform.localScale.x+ delet,
                    go.transform.localScale.y, go.transform.localScale.z);
            }
            else if (a == Axis.Y)
            {
                delet =pos.y - lastPos.y;

                go.transform.localScale = new Vector3(go.transform.localScale.x ,
                     go.transform.localScale.y + delet , go.transform.localScale.z);
            }
            else
            {
                delet = pos.z - lastPos.z;

                go.transform.localScale = new Vector3(go.transform.localScale.x ,
                    go.transform.localScale.y, go.transform.localScale.z + delet );
            }
            //过渡
            lastPos = pos;
        }
    }

最后发给大家一个我自做的插件（专门用来在运行状态下编辑物体空间属性的）

链接：https://pan.baidu.com/s/1V4JOeY1HlVaL1GxvHvUDZA 密码：lkbe